Stop motion for axminster looms



May 25, 1948. w. Y. ROBB STOP MOTION FOR AXMINISTER LQOM Filed May' 29, 1947 2 Sheets-Sheet 1 \NVENTOR ROBE WALTER I A T T O R N E Y May 25, 1948. w, RQBB STOP MOTION FOR AXMINISTER LOOM Filed May 29, 1947 2 Sheets-Sheet 2 FIG FIG.3

INVENTOR WALTER Y. R053 ATTORNEY Patented May 25, 1948 TED PATE N T CE 2,442,178 sw'ermomstos AXMiNSTEREfiQMS Walter Y. Robb, Whitinsville,.Mass., alssignonto :Cizompton & Knowles Loom.Works, Worcester, Mass.,aieorporation of Massachusetts iliicat iij flay 2'9, 1947, Serial No. 75;?43

'1 This inynt'ionrelats toilimninster looms'and itis the general object of the'inyention tofprojvide n'ieans forstppping the 1mm if a tube frame teiielmr jynirai fto ieg'iste "correctly mm the tran porting chain when biiigieturned' tested, or one 'br "another or the hooks which support the tube fifafifeinaybreak. 'Underthese conditionisjthe 'tiib'e jfrarrie will 'iial lon the cloth 'aiid. interfere with the lay and the tuftgiittin "It is fan m o tant-mm of the present "iii'yentioh fto ar viee "electric means controlled pm bearhbf light which will be integeepted by @raarea te s-e eb yswiipa e.

whenthe itiibe fna inesjare reIhOVedfr Qm the chains in norrnal bperationsfihey will'intercept 'tiie'beam' of 'lig'httwicegonc'e whil'e inoving down- P' llia gi il fi? ii D Fifi Q a a in when i'turiid tot he chain s. Since these interc'eptioiis edc 'r reg'liljarlyit is n cessar to p efifenttliemflfroin'stopping thelooin, 'It i s ano er jobiectqr jthe brs'eiit'iriyention pp rovi e pasteelectrioally controlled stop, eans an conjunction withlaswitch or 'the like whicfiwill 'come into action during those intervals of tube fijanie movement the jfattjerfnorinally intercepts the eam-5r lig'iit winsuie continued loo-m running. I

flit occasionally 'liaigiiens'that only one "end of {the ube frairi'e'lwill fbeboifriectly attached to the ftraiisfiortirig'ehain, in 'e'ritth'e ther end jgiil ljiia'll wan iinproger position. In order to effect loom stospa e under condition it is another object of the intention to employ wo beams of li'ght or'i'e "foieac'ih jnfi of the 100m, 'l'fi'ective to'sjgoli the} n'i ifeither beain'is intertested at any tiriidther than the a min intervalsof'interception. I I

With these and other dbiets in view whim will*apfiarasthedscfiintion proceeds, g ven; ti0liidf5 in the gornbination and arrangement of parts'hefeinaiter described and set forth.

jig "the ac ge nsm y ng enemas, wherein two 'forrn's or the nteiitienare set forth, I

1 is a sidefievatio of the forward part of an Agir'iinjslter 19 In hav ng the preferred "form of the inyntipn applied thereto, 1 i I t Fi .2 afront e eiiafion looking in the d recqei i e 1 a i a 'iiiaeimlti b yew init ates 12 claims. (0 .1395313m 2 v mannerin which'one'end :of the tube frame may fall when its:othe r end :is attached, to the .ohain, Fig. 4 isa diagrammatic viewof the preferred term of the electric circuit wherein the solenoid 'foreffeotiri'g loom stoi bageis normally deener- "Fig. 5 is'a'xi-iagrami of a modified circuit to be nsed'in conjunction with'thetgreatier part of the circuit shown'i'n Fig. '4, but Twherein the solenoid 'isLriornietlly energized, and.

Fig. 6 is a diagramof an "alternate location 'for'the control cam. I

Referring particularly to Figs. 1 and 2, the m frame It supbortsa bottom or .oa'm shaft ll gearedtoa motor 'M. The lay i2 reci'pro'ca'tes in'usual manner to "beat up weft inthe warp shed florme'd byfth e warp threads W. The loom has a chain pullovershait l5 opeiat'ed'inthe usual manner'by mechanism. not. shown to advance transportingchains IiB step biyst'ep. Thechain has attached thereto a plurality of tube frames l1 whi'ch'moveonelbybneitoa transfer station dirotly'urrd'er the pullover shaft l.5.. Tube frame transfer arms 18 disconnect the tube frame'in transfer 'positi'on from the .transporting chain system and mov'eit downwardly towardthe cloth C'for a tuft-forming operation; The tube frame is then moved upwardly a short distance. and front'andba'ck tuft cutting knives 19"and'20. cut the formed tufts from the tubeframe. The .lat- 'ter is then returned to the vchain which is then movedaniother step'so that the next tube frame can be'mo've'dto the transfer station.

The operation just described is that "occurring normally when the tube frame cah be detached from and reattached to the transporting -chains without mishap. "If, however, the tube frame should fail to be correctly attached to the transipqrting chain's part or an or it Wil1' fa1l when released warm [8. Qnecondition which can resu t;rrcm imprope operation ofthe tube'frarne is shownin Fig.3, where 'theright end is shown as having {alien to an improper position while the "left erid'is held by the associates 'p'hain It, If 'both endfs'f'ail tobe attached the tub'e fr anie will jfa'll on the cloth between jkniyes :19 and '20. [It also happen that a tube iranie which has been returned to both chains will tall due to breakage of the holding hooks as the einieyer wims U ide h di tl s r s e a c n- ;d itio'ns it isfhiglily"desirable to be able to stop ie' wmxmtemvtiyv n tam n th p ssntiiwe ti n in js i q id ke Qffih m t i is ime so p t-neat, i e s er V be intercepted by. a tube frame moving normally from the chain to tuft forming position and then and 28, respectively, one for each cell. The beams of light between corresponding cells and sources may be substantially horizontal and are'maintained throughout loom operation; V V

It will be understood from Fig. 1 and. the description previously given that for each tuft forming operation of the loom the beams of light will normally be intercepted twice, and to prevent improper stoppage during these periods or intervals of interception provision must be made to permit continued running of the loom. This result is accomplished by a cam' 30 preferably secured to the bottom shaft and turning in time with the mechanism which operates the transfer arms I8. The cam has'two points. 3| and 32 between which are located low dwells 33 and 34. If the loom is of the so-called three-shot type there will be a tuft forming operation every third beat-up of the lay l2, and shaft Hand cam 30 will complete a rotation every third pick.

The electric connections for the preferred form of the invention are shown in Fig.4 and include a loom controlling solenoidcircuit and photoelectric circuit means for the solenoid circuit. The

latter circuit includes a motor controlling solenoidf'which'is normally 'deenergiz'ed but when energized is effective to stop the motor M by well known means not shown. This circuit includes the secondary'36 ofa'transformer T, 'and two switches, switch 31 being normally open but closeable by a'relay 38 when the latter is energized, and the second switch 35 being normally closed but under control of thecam 30 in such manner as to be opened twice foreach tuft forming cycle by the cam points 3| and 32. Whenever both switches 31 and "39 are'closed solenoid 35 will be" and plate is connected to one side of the relay 38; The other si'deiof the relay is connectedjto one side of secondary l5.the other side of: which is'grounded. Section 46 of secondary supplies Y power'for operation'of the photoelectrically controlled part ofthe circuit shown at the right of Fig. 4. This part ofthe circuit includes a variable resistor R and resistances R and R2. connected as indicated in Fig. 4. The two photoelectric cells ortubes are in paralleland connected across wires *48; and .49, thelatter being connected through a resistance 50pto the grid 4|. Condensers 52 and 53 are "employed as indicated.

The source of light zland 28 are supplied with electric power from the secondary 36, and are constantly illuminated. So long as the cells 25 and ZBare energized by light the grid 4| is maintained sufliciently negative to prevent firing of tubeE. Whenever one r the other or both tubes 25 and 26 fail to receivelight the grid 4| becomes the condition of the control grid. ;Also,;;thei photoelectric cells can be used in conjunction with a loom controllingsolenoidwhich is either normally 'deenergized' or normally, energized. 7

34 will permit closure of switch 39.

of light.

sufficiently positive to permitfiring of tube E to energize the relay 38. 7

It will be understood that the cells twice for each normal tuft forming operation of a tube frame. During the-tworperiods of normal interception of the beams of light tube E will fire, thereby closing switch 31. Carh3il, however,

operates in such manner that during these periods of light interruption its points 3! and32 will open switch 39, thereby preventing energization of V solenoid 35 which would otherwise ensue upon closure of switch 31.

As soon as the tube frame in its normal operation moves away from the beams of light one or another of the dwells 33 or The result of this relationship is to permit closure of the solenoid circuit upon energizationof relay 38 at any time in the cycle of the loompther than the;

of light, thus energizing relay 38, but at this time switch 39 will be closed, due to'the position of cam 30, and solenoid '35 will therefore actto ,7

stop the motor M. A similar condition will exist if the tube frame should happen to fallacross a corresponding to the cam points3l and 32.;

In the modified form of the invention a solebeam of light at any time other than the intervale noid iifi'similarto solenoid 35'is normally energized and its deenergization efiects' motor st ppage by well known -meansrnot shownp Inthis 7 form of the invention the transformer secondary 36 has one side thereof connected to switchesfil and E2 simlar to switches3land 39, respectively. Switch 5! is normally in the closed position shown in Fig. 5"while, ce11s;25 and 26, are activated by light, and relay 38 is dead. 7 Switch 6| will, however, be opened twice for each tuft forming-cycle 1 when relay '38 is energized by inactivation of the photocellsas the tube frames cross thelbeams of SwitchGZ is normally openbut is closed by the cam 'points3l and'32 when: relay 38 is light.

normally energized.

Under normal operations gization of solenoid, 60 to permit continuedrum ning of the loom, since switcher-will be closed by the cam when switch BI is open. If atube framefshould fall with resultant energization' of V relay 38 while switch 62 is open the resultant opening of switch 6| willdeenergize to efi'ectmotor stoppage. I 1

Cam 30 has been describedas controllinglthe solenoid circuit, but if'desire'd it can be used to controlthe relay circuit instead. Thus, in Fig.6 a switch 65 in the relay circuit is normally closed but is opened momentarily b cam whenever the tube From the foregoing it'will be seen that I have provided means for stopping an Axminster loom in the event that a tube. framefalls out of the chains is. This result is obtainedwhether-both endsor only one end of the tube "framefallsg since a shadow on eithercell 25 or :25 will-change 2 s and 2s will normally be inactivated or un-illuminated therefore-"secondary V .36 will be able-to maintain-uninterrupted-enersolenoid 60 7 frame intercepts'the beams The cam--30 acts tosmaintain. normal conditions when the beams oflight are regularly intercepted during normal movements of "the -tube frame incident to:- a tuft forming; operation. If atube I frame should! intercept eitheror both beams of light at any: time -other than the: normal: periods for interception a change will occur imthe 'cnergization :of relay 38 "and solenoid 35 or Bil to effect loom stoppa e.

"Having thus described my invention itrwill be seen that 2 changes and :modiflcaticns may -be -made therein .bY'ithOSBr'SkilIGd inthe' art without f departing 'from-lt'he spirittand scope ofLthe i'nVention and I do not wishito be limited-to the 1 details "therein :disclosed, "but what I clai m is:

.1. In an 'Axminster Lloom 'oper-ating -with a transporting: system. from which tubeframes a're removed oneiataItimeiduringituft forming intervals,aphotoelectricicelLi-a sourceioflight providing abeam of light-normally illuminatingsai'd cell, and electric means controlled by said rear effective when said beam is intercepted by "a tube frame falling from a;portion'ofsaiwsystem at-any time other than during a tuft forming' intenral to'initiate loom stoppage.

2. In an Axminster loom operating-' -with =tube frames on a transporting system, ti -photoelectric cell, means providing a beam'of light for-ill umi- -nating the-cell, said beam located in (position to 'be intercepted 'by a tube fram'e improperly;

falling from a portion of 'tnessystem 'and out of control of the loom, an "electromagnetic devi c'e effective upon a change in the .zmag-n'etic field thereof to initiate loomstoppaga ah electric rcirf cuit operative upon-a change from normal to abnormal condition thereof 'to cau'se' said-change in the field of said device, and electric circuit means controlled by said photoelectric cell and effective upon a change in the illumination of said cell due to a falling tube frame out of control of the loom to change the condition of said electric circuit from normal to abnormal and thereby cause a change in the magnetic field of said device.

3. In an Axminster loom operating with tube frames which move one by one from a transfer station to tuft forming position and then return to the transfer station, electric loom stopping means effective upon an electric change therein to cause loom stoppage, a photoelectric cell normally illuminated by a beam of light which is intercepted at regularly recurring intervals by a tube frame moving normally toward and away from tuft forming position, electric control circuit means controlled by said cell normally tending to cause an electric change in said electric stopping means whenever the beam of light is intercepted by a tube frame, and means effective during said intervals only to prevent an electric change in said electric stopping means.

4. In an Axminster loom operating with tube frames which move one by one from a transfer station to tuft forming position and then return to the transfer station, stopping electric circuit means including an electromagnetic device effective upon a change in the magnetic field thereof due to an electric change in said circuit means to cause loom stoppage, a photoelectric cell, a source of light providing a light beam normally falling on said cell, a tube frame when moving normally toward and away from tuft forming position intercepting said light beam at regularly recurring intervals, control electric circuit means for said stopping circuit means controlled by the cell and normally tending whenever said 6 light beam-is intercepted'to' cause an electric change-in-saidstopping -circuit means and said *magneticfieldjarid means-to prevent an electric changein saidstopping circuit means field during said intervals only.

5'. InTan'Axminster *loomop'erating with a tube frame having aa-period of movement toward and a'way "from tuft forming position, an electromagnetic device efiective'upon' a change in the 'magnetic fieldtl-iereof to cause loom stoppage, electric circuit means which when altered electrically -chariges said'magnetic field, and two -'controls 'for the electric circuit means, one con- 'trol incluc ling a photoelectric cell the illumina- -ticnof whichis-interrupted'at given intervals during-said periodof movement of the tube frame, said one 'control'te'nding whenever the illumination of'saidcell is interrupted during said period to "altrthe electric circuit means to cause a "change in said'magnetic field, and. the other control acting duringsaid intervals only to prevent electric'alteration of said electric circuit means.

6f In an Axminster-loom operating with tube frames which 'have normal movements one by one from a transfer station to tuft forming position and'then backto' transfer station, an electromagnetic device effective'upon a change in the magnetic :field thereof "to cause loom stoppage, electric circuit means which when altered electricall'y causes'a change in said magnetic field, and two controls for'the-eleictric circuit means, onev control including a normally illuminated photoelectriccell and tendingwhen'ever the illu initiation of the *cell is interrupted by a tube frame-to alter the-electric'circuit-means to cause said change in said magnetic field, and the other control acting periodically in timed relation with said normal movements of a tube frame to prevent the first control from altering said electric circuit means.

7. In an Axminster loom operating with tube frames which normally move one by one toward and away from tuft formingposition, stopping electric means including an electromagnetic device effective upon alternation of the electric condition thereof to change the magnetic field of said device to cause loom stoppage, a photoelectric cell adjacent to each end of the tube frame, light source means providing two beams of light, one for the illumination of each cell, which are intercepted at regularly recurring intervals by a tube frame moving normally toward and away from tuft forming position, electric circuit means controlled by both cells tending normally to cause alteration of said stopping electric means whenever either beam of light is intercepted by a tube frame, and means effective during said intervals only to prevent said electric circuit means from altering the electric condition of said stopping electric means.

8. In an Axminster loom operating with tube frames which normally move one by one toward and away from tuft forming position, an electromagnetic device effective upon a change in the magnetic field thereof to cause loom stoppage, a photoelectric cell, light source means providing a beam of light normally illuminating said cell, said beam of light being interrupted at regularly recurring intervals by a tube frame moving normally toward and away from tuft forming position, electric circuit means controlled by said cell tending normally to cause alteration 7 of said magnetic field whenever the beam of light is intercepted by a tube frame, and means effective during said intervals only to prevent said electric circuit means from causing alteration of said magnetic field. I I

9. In an Axminster loom operatingwith a tub frame which has a normal movement toward and from tuft forming position, an electromagnetic device effective upon a change in the magnetic field thereof to'cause loom stoppage, electric circuit means normally maintaining said field unchanged but effective upon electric alteration thereof to cause said change in said field, and two' controls for the electric circuit means, one control comprising photoelectrically means including a beam of light and tending to alter the electric circuit means to effect a change in said field whenever said beam of light is intercepted during said movement of the tube frame,

said tube frame intercepting said beam during a.

given interval in said normal movement thereof, and the other control including a cam operated switch moving in time with the tube frame dur- 'ing said normal movement thereof and effective to prevent the first control from altering said,

electric circuit means during saidinterval. V

10. In an 'Axminster loom'operatin-g with tube 7 also controlling said electric circuit means, photoelectric means including aiphotoelectric cell energized by a beam of light effective when said beam of light is intercepted to cause said relay acting moving in timed relation with a tube frame having said regular movements acting on said switch 7 during said given intervals only to prevent said relay from altering said circuit means.

11. In an Axminster loom operating with at regularly recurring intervals during normal loom operation, a photoelectric cell normally illuminated by said beam of light, normally open electric circuit means including an velectromag-.

netic device which isenergiz'ed only when said circuit meansisclosed' and when energized initiates loom stoppage, a second electric circuit means controlled by said cell and effective when said saidintervals only to maintain the first circuit means open. a 12. In an Axminster loom operating with tube frames which normally intercept a beam of light at regularly recurring intervals during normal loom operation, a photoelectric cell normally illuminated by said beam ofilight; normally closed electric circuit means including an 'electromagnetic device energized when the circuit means "is closed but effective upon deenergization thereof due to opening of said circuit means to initiate loom stoppage, a second electriccircuit means controlledxby said cell and'effective upon interception ofsaidubeam oflight to open the first circuit means, and means operative to maintain the first circuit means closed during said intervals only. i 1 WALTER Y. ose?- tube frames which normally intercept a beam of light 

